[PATCH] [x86] generalize reassociation optimization in machine combiner to 2 instructions

[Sanjay Patel]

Patch updated based on Gerolf's feedback.

Also, I checked in the name change: hasPattern() -> getMachineCombinerPatterns().
http://reviews.llvm.org/rL240192

...because that's independent and NFC, so this patch is reduced to just the MachineCombiner and x86 files again.


http://reviews.llvm.org/D10460

Files:
  lib/CodeGen/MachineCombiner.cpp
  lib/Target/X86/X86InstrInfo.cpp
  test/CodeGen/X86/fp-fast.ll
  test/CodeGen/X86/machine-combiner.ll

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